ABAP Select data from SAP table IDTW_S_TAXITEM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IDTW_S_TAXITEM table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to IDTW_S_TAXITEM. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the IDTW_S_TAXITEM table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_IDTW_S_TAXITEM TYPE STANDARD TABLE OF IDTW_S_TAXITEM,
      WA_IDTW_S_TAXITEM TYPE IDTW_S_TAXITEM,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <IDTW_S_TAXITEM> TYPE IDTW_S_TAXITEM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_IDTW_S_TAXITEM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM IDTW_S_TAXITEM
  INTO TABLE IT_IDTW_S_TAXITEM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDTW_S_TAXITEM
*  INTO TABLE @DATA(IT_IDTW_S_TAXITEM2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_IDTW_S_TAXITEM INDEX 1 INTO DATA(WA_IDTW_S_TAXITEM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_IDTW_S_TAXITEM ASSIGNING <IDTW_S_TAXITEM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDTW_S_TAXITEM>-FORMATCODE = 1.
<IDTW_S_TAXITEM>-SELLERTAXID = 1.
<IDTW_S_TAXITEM>-NUMBERING = 1.
<IDTW_S_TAXITEM>-TWYEAR = 1.
<IDTW_S_TAXITEM>-TWMONTH = 1.

ENDLOOP.

LOOP AT IT_IDTW_S_TAXITEM INTO WA_IDTW_S_TAXITEM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDTW_S_TAXITEM-BUYERGUID, sy-vline,
  WA_IDTW_S_TAXITEM-TWGUINUMBER, sy-vline,
  WA_IDTW_S_TAXITEM-SALESAMOUNT, sy-vline,
  WA_IDTW_S_TAXITEM-TAXATIONTYPE, sy-vline,
  WA_IDTW_S_TAXITEM-TAXAMOUNT, sy-vline,
  WA_IDTW_S_TAXITEM-DEDUCTIONTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDTW_S_TAXITEM you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_IDTW_S_TAXITEM TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_IDTW_S_TAXITEM INTO WA_IDTW_S_TAXITEM.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_IDTW_S_TAXITEM_STR, 
FORMATCODE TYPE STRING,
SELLERTAXID TYPE STRING,
NUMBERING TYPE STRING,
TWYEAR TYPE STRING,
TWMONTH TYPE STRING,
BUYERGUID TYPE STRING,
TWGUINUMBER TYPE STRING,
SALESAMOUNT TYPE STRING,
TAXATIONTYPE TYPE STRING,
TAXAMOUNT TYPE STRING,
DEDUCTIONTYPE TYPE STRING,
BLANK TYPE STRING,
SPECIALTAXRATE TYPE STRING,
REMARK TYPE STRING,
REMARKCUSTOM TYPE STRING,
CURRENCY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDTW_S_TAXITEM_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_IDTW_S_TAXITEM_STR-FORMATCODE sy-vline 
WA_IDTW_S_TAXITEM_STR-SELLERTAXID sy-vline 
WA_IDTW_S_TAXITEM_STR-NUMBERING sy-vline 
WA_IDTW_S_TAXITEM_STR-TWYEAR sy-vline 
WA_IDTW_S_TAXITEM_STR-TWMONTH sy-vline 
WA_IDTW_S_TAXITEM_STR-BUYERGUID sy-vline 
WA_IDTW_S_TAXITEM_STR-TWGUINUMBER sy-vline 
WA_IDTW_S_TAXITEM_STR-SALESAMOUNT sy-vline 
WA_IDTW_S_TAXITEM_STR-TAXATIONTYPE sy-vline 
WA_IDTW_S_TAXITEM_STR-TAXAMOUNT sy-vline 
WA_IDTW_S_TAXITEM_STR-DEDUCTIONTYPE sy-vline 
WA_IDTW_S_TAXITEM_STR-BLANK sy-vline 
WA_IDTW_S_TAXITEM_STR-SPECIALTAXRATE sy-vline 
WA_IDTW_S_TAXITEM_STR-REMARK sy-vline 
WA_IDTW_S_TAXITEM_STR-REMARKCUSTOM sy-vline 
WA_IDTW_S_TAXITEM_STR-CURRENCY sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.